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Oil and Gas Reserve Data - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves: (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Extractive Industries [Abstract]
Future cash inflows	$ 52,900,000	$ 64,783,000	$ 56,413,000
Future production costs and taxes	(14,893,000)	(16,031,000)	(11,086,000)
Future development costs	(4,850,000)	(4,530,000)	(4,029,000)
Future income taxes	(6,374,000)	(9,920,000)	(9,118,000)
Future net cash flows	26,783,000	34,302,000	32,180,000
Annual 10% discount for estimated timing of cash flows	(12,414,000)	(14,946,000)	(14,528,000)
Standardized measure of discounted future net cash flows	$ 14,369,000	$ 19,356,000	$ 17,652,000

This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future net cash flows relating to proved oil and gas reserves.

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- Definition

The estimated future income tax expenses that will be incurred based on the future income less future expenses derived from production and sale of proved oil and gas reserves in this geographic region.

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- Definition

These amounts are the result of subtracting future development and production costs and future income tax expenses from future cash inflows for each geographic region where proved oil and gas reserves exist.

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